Oxygen → Orthosilicic acid

HRID 839492Notes

Reaction equation

HRID 839492 reaction equation
O.O.O.O.O.[O-:6][Si:7]([O-:9])=[O:8].[Na+:10].[Na+].[S:12](=[O:16])(=[O:15])([OH:14])[OH:13].O=O>>[Si:7]([OH:13])([OH:9])([OH:6])[OH:8].[S:12]([O-:16])([O-:15])(=[O:14])=[O:13].[Na+:10].[Na+:10]

Participants

5

Reactant 3

HCID 977OxygenHCID 1118Sulfuric AcidHCID 61495Silicic acid (H2SiO3), disodium salt, pentahydrate

Product 2

HCID 14942Orthosilicic acidHCID 24436Sodium Sulfate

Procedure

About 15 parts by weight of granular sodium metasilicate pentahydrate are slowly added to about 8 parts by weight of concentrated sulfuric acid while agitating and keeping the temperature below 100° C. The reaction takes place under ambient pressure; oxygen is evolved and the reaction is complete in 1 to 2 hours, thereby producing a white granular silicic acid compound and sodium sulfate. The mixture is washed with water, filtered to remove the salt and water, thereby recovering the silicic acid compound. The silicic acid compound is air dried at 25° to 75° C.

Workup

  1. customthe temperature below 100° C

Sources & evidence

ORD record
ord-e43ae61f12d44fca8e60ae769fc8a71d
Source dataset
uspto-grants-1978_06
Patent number
US04096121

Reaction notes

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